Synovial osteochondromatosis
Overview
A rare joint disorder where some of the tissue that lines the joint is replaced by bone-like tissue or cartilage. Usually only one joint is affected and it tends to be the knee, elbow or hip.
Symptoms
* Joint pain * Limited joint mobility * Joint locking * Joint swelling * Asymptomatic
Causes
cause is unknown.
Diagnosis
* Trauma-related: - Fracture with avulsed fragment - Fragmentation of meniscus with calcification * Degenerative joint disease related: - Degenerative joint disease with detached spur * Synovial proliferation: - Pigmented villonodular synovitis * Neoplastic: o Synovial chondrosarcoma * Other: - Osteochondritis dissecans - Sequestrum from osteomyelitis - Neuropathic (Charcot) joint Intra-articular bodies in SOC typically have popcorn calcification, with a dense sclerotic border with radiolucent central region. This distinct radiographic appearance sets it apart from other cause of intra-articular bodies. Number and size of intra-articular bodies can prove helpful as well. SOC typically presents as multiple intra-articular bodies. Few or isolated intra-articular bodies are more consistent with trauma or osteoarthritis.
Treatment
Surgery to remove joint lining tissue